In his follow-up to the best-selling Ultramarathon Man—which Sports Illustrated called "fascinating" and the New York Times said was "full of euphoric highs"—world-renowned ultramarathoner Dean Karnazes chronicles his unbelievable exploits and explorations in gripping detail. Karnazes runs for days on end without rest, across some of the most exotic and inhospitable places on earth, including the Australian outback, Antarctica, and the Tenderloin District of San Francisco.Fro